/**
* Returns a string representation of the identifier of a given entity.
*
* @param mixed $entity
* @param EntityMetadata $metadata
*
* @return string
*/
public function getEntityId($entity, EntityMetadata $metadata)
{
$result = null;
$idFieldNames = $metadata->getIdentifierFieldNames();
$idFieldNamesCount = count($idFieldNames);
if ($idFieldNamesCount === 1) {
$fieldName = reset($idFieldNames);
if (!$this->objectAccessor->hasProperty($entity, $fieldName)) {
throw new \RuntimeException(sprintf('An object of the type "%s" does not have the identifier property "%s".', $metadata->getClassName(), $fieldName));
}
$result = $this->entityIdTransformer->transform($this->objectAccessor->getValue($entity, $fieldName));
} elseif ($idFieldNamesCount > 1) {
$id = [];
foreach ($idFieldNames as $fieldName) {
if (!$this->objectAccessor->hasProperty($entity, $fieldName)) {
throw new \RuntimeException(sprintf('An object of the type "%s" does not have the identifier property "%s".', $metadata->getClassName(), $fieldName));
}
$id[$fieldName] = $this->objectAccessor->getValue($entity, $fieldName);
}
$result = $this->entityIdTransformer->transform($id);
} else {
throw new \RuntimeException(sprintf('The "%s" entity does not have an identifier.', $metadata->getClassName()));
}
if (empty($result)) {
throw new \RuntimeException(sprintf('The identifier value for "%s" entity must not be empty.', $metadata->getClassName()));
}
return $result;
}
